Coiled tubing module for riserless subsea well intervention system

a technology of risers and modules, applied in the direction of drilling pipes, wellbore/well accessories, sealing/packing, etc., can solve the problems of large, complex installation, and inconvenient installation of risers, and achieve the risers needed, and the risers are not easy to be rolled

Inactive Publication Date: 2012-08-02
WILD WELL CONTROL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Subsea crude oil and/or natural gas wells frequently require workover to maintain adequate production.
The main disadvantage of thi

Method used

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  • Coiled tubing module for riserless subsea well intervention system
  • Coiled tubing module for riserless subsea well intervention system
  • Coiled tubing module for riserless subsea well intervention system

Examples

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Embodiment Construction

[0020]FIG. 2A illustrates a pressure control assembly (PCA) 100, according to one embodiment of the present invention. The PCA 100 may include a tree adapter 105, a fluid sub 110, an isolation valve 115, a blow out preventer (BOP) stack 120, a tool housing (aka lubricator riser) 125, a frame 130, a control pod 135, a manifold 140, and one or more accumulators 145 (two shown). The tree connector 105, fluid sub 110, isolation valve 115, BOP stack 120, and tool housing 125 may each include a housing or body having a longitudinal bore therethrough and be connected, such as by flanges, such that a continuous bore is maintained therethrough. The bore may have a large drift diameter, such as greater than or equal to four, five, six, or seven inches to accommodate a bottom hole assembly (BHA) of a workstring (discussed more below) and the crown plugs 56u,l of the tree 50.

[0021]The tree adapter 105 may include a connector, such as dogs 105d, for fastening the PCA 100 to an external profile 5...

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PUM

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Abstract

A method for riserless intervention of a subsea well includes connecting an intervention assembly to a bottom hole assembly (BHA). The BHA is connected to coiled tubing. The method further includes lowering the intervention assembly to a blowout preventer (BOP) fastened to a subsea production tree using an injector of a support vessel engaged with the coiled tubing; fastening the intervention assembly to the BOP; slacking the coiled tubing using the vessel injector; engaging a stripper of the intervention assembly with the coiled tubing; and driving the BHA through the tree and into a wellbore using a subsea injector of the intervention assembly while synchronizing both injectors to maintain the slack in the coiled tubing.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]Embodiments of the present invention generally relate to a coiled tubing module for a riserless subsea well intervention system.[0003]2. Description of the Related Art[0004]Subsea crude oil and / or natural gas wells frequently require workover to maintain adequate production. Workover operations may include perforating, gravel packing, production stimulation and repair of a downhole completion or production tubing. During the workover, specialized tools are lowered into the well by means of a wireline and winch. This wireline winch is typically positioned on the surface and the workover tool is lowered into the well through a lubricator and blowout preventer (BOP). Workover operations on subsea wells require specialized intervention equipment to pass through the water column and to gain access to the well. The system of valves on the wellhead is commonly referred to as a production or Christmas tree and the intervention ...

Claims

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Application Information

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IPC IPC(8): E21B29/12
CPCE21B19/002E21B33/035E21B19/22
Inventor HOFFMAN, COREY EUGENECARGOL, JR., PATRICK MICHAEL
Owner WILD WELL CONTROL
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